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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a2d6c7be3a7376fe5dffce420e0ef6ab1d060a76689d95a933c7aa65a375b8' 
  AND token = 'QHXGi/gPrsU7p8DVQQM7ygY7fTbWAUkAgIFc77Tv4aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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