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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872056c38baea88235b49d2e88eaedbf1659df0422b8362db6c12e807373733b' 
  AND token = 'v/WIRjhBNH79HvV1kz2EBHq+KgllcuaAEiC6+vr3rA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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