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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ef80d5562df6d52c66e3e616d356924530e9c1f4e92b877ae31d9499cd3a0e' 
  AND token = 'k19EO79EroNWPNg5YuvhiWykpGkwTGoiu5g3tzgrBAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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