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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5234a7dff6760b6ccd927eb716740118972a214403a8dcbf1c49b75ac49a45b' 
  AND token = 'tLHzArZhmFRbkgYMNLA6GUxrbaTgikiv5lz51ojt+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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