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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925a67f6e5fdbfb8f026ff744d550086fc4be62bb44e66f2cc23ce1aac117c28' 
  AND token = '4HhbCrl3CsCSvyLwH/ouhB2GHSlfHdbH2/vtbM5mg6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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