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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3c35d9980c588ae66d7aa3fa501de6d2926ba8decc50c3e31aa244b48c576f' 
  AND token = 'b0fJKlikq9MfyDqMmFUBeyRtn9RyFakHAOT6zEzuFdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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