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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab49d7292a24b3a6f506a4393d0ab514d83307f3be35a81a1f7d44582371fc8f' 
  AND token = 'Ruet1dXZcPeuhf6wNdaM2ogTVITsvWu0yeXI5UnSfoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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