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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dc2f37bfd51fc640e583fe87f96ed7329b29b6629e58e386bacb6c7678ccc9' 
  AND token = '0ZvRYTyICwRPcfDzP5hAe4I/Kp2TKVvIoz54ULAEUOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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