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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5facbcfcbc4eb621b35b03abbedcb6df6b61caa43bdffc1dd48dde7ee6b7b94' 
  AND token = 'aohlKma7EAqni/xoruI6NT8Q2XmL8tPcybJHHDYAL8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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