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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b692fab903189ee9b22ce73e2ea6f7973f376fd5cfb21ba5f5e33ff1bac2e7' 
  AND token = 'eQRvJ/fYlE3M0UeBvllHG1w9IKG6OHof8LO7SDumU/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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