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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1156d02895440a1e72bbd40c64de62729a9b0c36ed9dd8edfa4fcd357a037688' 
  AND token = 'rd6zRC7ez4mzcA0ZtzhyxoKbb0eXbQiNisQYROT2XCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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