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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc77f3004f68d5645a0bbbc33b20fe18cf0b40a7a82e5e43951cb5f50f41845' 
  AND token = 'SJ8ARussVHfbYPQTbGxWGMF8UBLS9BnFm18Bl7DmK9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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