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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dc4553d47b7e2208123470d6ec4c159052854c74e91fd8d0a45e0fdc865d34' 
  AND token = 'jWed58dTiKgnBmW+eCETSouL4XK4v5qbJhD82UQ0w8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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