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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e55faaba31afe4d4f27fabe1f6c940586b4ab960db6e19b633c6a272ef7e03' 
  AND token = 'nvYYRnCk4ICFcx8xl5gsmVnk2hKzeYXfjm1g3AKSGQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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