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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e1c60e2f1231a154e404c6c2a294b450a685a34125b14350cd76be2569f955' 
  AND token = 'qEsA7B2q41TOEFrczpiBjThOCCi9EXEwKEBVGLXqT7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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