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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e13e5ad439c369090ed5af163c0ab1d9a565a286bc45b9698b6c41ae0a494d8' 
  AND token = 'q8kvsry3D6hrlOkeFRIQOYlxfK38XTjidum18iw3BNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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