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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de28e25dd39cec9f1ebbc49ca1dfbbdb2c87073e2889f5857c349ee3953a2ef' 
  AND token = 'b1ctBc+aboRNfU30mJbsVwUq/k0cLXHoj95ODkX/cJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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