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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84828e9fb722bdc51181a75d2b1e73a0a2946c99cd7d089ccbc2fb3350c5db25' 
  AND token = 'cKcDaX0R+PXZdKJ+dhABT4wmqI+Ml29bAvXxhX+pJ/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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