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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39cc5f48cec842bb341d739eb7efb3203f9dbca2f36ffc618eddb2baf525ae7' 
  AND token = '5GFEuYbRpBeyrx5XT4cRg7VJirGdHqtkzKTTc6TNWLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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