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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abc2a8e1d672fa55d4cbd9bf8be21c2d88a38b1db7f3b8d9105fb281c47b868' 
  AND token = 'oWVQkf8xpjndqsaBk2XDUUEgLod2njuzb+23ZhP49u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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