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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56524b22c5e7a20a3663b12121d1387e4ee844067dd7248a56d3e385e0eb8b54' 
  AND token = 'oQ/kmcSBCk3stnazOCJVSwrnzpnb59mUSWkNQocFVq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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