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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e764634d18301e35e7402b16e76704f96a0efda743c9c0530f850d9da6456458' 
  AND token = '96CK1CER+ZYWLAfgPTau88jmaLapiaOGV+uh07cr/As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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