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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a386f6c1e77c9fe72ece4a77175716a335d9a3a252680d570d64b9b505cdb585' 
  AND token = '8C/IykhBMp9mZ7lJ9AxUZJw6CO32LBJ256nc30Odypk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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