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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9d8f97aabf55e2f9301e2aee782a2539178b1c3381b959a637952e175aae36' 
  AND token = '73uLCfk+/fsIKNP/1Lfpak7nsX2u8Q//d9LnJ/4lKYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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