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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790fc1a667914f94591a7b7387c5c1cb970488d243fb2fa756d39cd1b8aa9a50' 
  AND token = 'GBQB7Ip1klx4eou4NcuiofNYrgonLPPct6Vb7RdKTH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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