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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d955d457eaaeea424cbefcd61b61cbbb07aa3d9cd11752037cc15daaad07e6' 
  AND token = 'zTZfxBULUD6Qi4CR7qKnRLivI0BbPoU3O2ul47RbyWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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