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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3e93b53d4b338dd90ac062db0611d542955ea3d2e00236c4d03f7f9154fef3' 
  AND token = '0Aeh9bNQ/UJKfWUQbsVVuEvVYYiWX15/jC9/wlml/+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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