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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17394da66a4c3f473a6e6b267b885a4a24c5d1b593302d6d8ea71e46f4e7d2a0' 
  AND token = 'PSnE3UxY8Q+eFkty9YJW2cJs5aXluR8ipXdwCS8OaSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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