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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9753227fde1865559e35d49efb88af7d94e91aec94739615099010cc3d127c1' 
  AND token = '0TNkdbR9UjX3UhU5b0wV70qEMwbk7SUGugkbmotLMPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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