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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a1d3472d25dc9eeff1b0370ddf58d504131bad9d8a7af5ff205bfcf0c123d7' 
  AND token = 'iZf74KaG1uGc+O37h39OHUNTspNE5rLHhmjz3u7mLQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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