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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd724152722ee53ca18f80f5821c88cd624bec4e2d2357ce5a3a0882f8f8b8a69' 
  AND token = '23q2jZpzMtAkcmHwMerXpXVG7HUNXPWyWEZjNJq28Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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