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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ec7a2f4915571b439f2e38823dbf0bcbc279eefd34496b3ac09c5794b61d5d' 
  AND token = '4KigmLVF6qEzWW6lRjp5A4c8dty2FFvumet1xD7fqUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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