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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a6836584c39edbebd2b13e479db8995525e9c0157d094a2173f9166f4ca770' 
  AND token = '8pSiOH95IzPHVKK3VfSB0jY5YLW/AoacLk42s2ChrD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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