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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1562186ddd0203b6da2a605a25fbff02966fc9530fb9544c4bb7de24d0d8abab' 
  AND token = 'QNk056+H0jY0wG4HIm0o+x5MmdQAHKCwAlGxBbatNHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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