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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256405ec972ac255a80b78ee2cecc346ae6267a8b5bfe58651b6b70d4a27ee2a' 
  AND token = '/QQ8u9m44DBoIO/+UF7i8Ceara5nMGfEDbgoOT7338c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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