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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e783f357c17d0ce2b5faf28a7f83a8051703ae2efdf7450caf06d87c1b2df5' 
  AND token = 'h4BMz3WtD7ahWqZkrl/5LdYohnoV6gjbMfZPCWlm7UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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