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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e1d4f85de3f0b9cf08827373de9293467538d83ce2146c76295a9601ad6fd6' 
  AND token = 'ugAvSvSMVib2S1gjkvFX+x4EaGGEecSnKlzr2R8EKTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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