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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2426138fd5cb081bae43eb7ad24d68c7e888a6a89724f3bb7782b39ae57881c5' 
  AND token = 'DkLy53dDHmMzcvQCckAaSsXcXWqq1JZ10PdFy9qH1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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