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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a24d4f520ab9203b6ef0ab01167ed9595779410078fd210b6af30b42265525' 
  AND token = 'LMRBDTcb1vDHr8CESwStyZGXXho2+t7+vqSCQ3+DXsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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