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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c331e06f2133044e7d131db58857b6a2ecdd6d54698b8735c41dfdfe7dcd30' 
  AND token = 'K371sE/ixofGj9GDNRRds3efbIvzClasPKnDYvFRdzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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