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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151031b4e2a767f89d6b06dc58f044e1c6ea370b17ec58191dabf37c2f76d0f7' 
  AND token = 'wJXEQkcpe611YP/HyNLFO/31xZvivxvFLHCtpQ8Ekws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}