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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44d8a3fa2e2c2c7f9427659fcdc3321d5edd926e836beb0c392bfa9b43b1f68' 
  AND token = 'zdhEWYmiy0rItQMFdyhAmSotVK8457HW0sD1ZVIJ6Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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