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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125c20964d76e537e73c498e92b60b3b40e079c92d7f3f32fba1c20137cde691' 
  AND token = 'KoeNsZd5DBRhWi8eVv23670FEqCaV4dDjH4iqrN4f3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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