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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b34f3fe91d753f898c18de4c8ef5090c888301cf4069e1a4f873358efc8e98' 
  AND token = 'hGM2c8FPuAJExEMF9/1ZVcnoXwHCn6Pv0ZLKIY9xRm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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