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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf990c15e914ac0d7a49e24680e926a0caf1605dc2375a402a9e7a73e60079b' 
  AND token = 'lK5AABa/tkXnF0zh9digWVZ7rmJEhA/TWAgw73EUIFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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