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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5613bac07ebd438531616ac0b2644f69c1f20eb280cc14b3ba56b8577c7b5a9e' 
  AND token = '91gTH0jWvFm8AdQd9QwLwt6IiPui89/5gI/uux2UXZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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