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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6775d3629107051bb4d206415c465dc3a84724db338480b612aa0103e1b6fd56' 
  AND token = '4ba/NbC0sJXTPlLD9FkTLl/nsCj+42iFByMz2NAAwh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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