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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54470cf068978002d964a50892cba40a5c9b1b041a082fa133d18dd5ba6db29d' 
  AND token = 'eXs0a7kepThIK8S7ir9mNGXdGRH4Anxl4NlC4b8Ubao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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