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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa001f85fb56c15aff73d2ab6148f15fd402d30b4dda2a24fcda1cbf80b3ba9' 
  AND token = 'zhHm/kSm8vjqLh/FIhPy8rwWyQDISdIuqnPh7w0erF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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