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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ef047f7f0f0489a4b7922565249da81490cec95bfd0826aad7bf3c14151601' 
  AND token = 'oyJSB5gGkHt9P5/s0F4JiFiIZWGZXNSM+PJ6RAbz50I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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