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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82503ad8463859f23ef7f9a6dd8a66ccfc394b1a9f6f1476d277687d7411fbf6' 
  AND token = 'Z0An29z3pWAh8Bq9o35meGlB/4kjfjw6dsXNzspokVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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