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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91340e588d57418dd18b30d65d3b5c33c68a194d550165ac5bd149962ff74428' 
  AND token = 'djpb4b2sfIN+prYlqOamrw/QDvvkPLD1P28Rn08gpPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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