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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b430d1cef6bc51a5f06521fb47afcf9c24f9d2023624c9879658a127c7d9a5' 
  AND token = 'fLacWbngWlPdkeVVflzQ+LF7oUh7Ce6j57RLTDo2ZPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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