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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad64daa58af581648d988e60c71dc045d496fd5d884287fd9fd9a048a5c69606' 
  AND token = '/1sdDU/FJCz2rnDrERjvKQ+rfG2C9CDmGpiLuynKffM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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