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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b763ecd9218d9dfc7e8517a46fad32d28da7b248af2b8e243c37f156d08b1705' 
  AND token = 'thqlroPPEvkPwGsqEeEPfaQTN66Kgo+YVeedOoODcSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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