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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633f6fa0bcbc824c7dacd48114af0c90d53717576d5c0d2f254df3120d64fa9b' 
  AND token = '52agni42+yOL7GHtbVw72G9pZUefvyD+A7deeDnI0ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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